Doc Feedback: Missing steps in the hashicorp:vault-lookup configuration

[JanakaPushpakumara]

Location : https://ei.docs.wso2.com/en/7.2.0/micro-integrator/setup/security/using-hashicorp-secrets/

The document does not specify about enabling the below synapse property in the conf/deployment.toml.

[synapse_properties]
"synapse.xpath.func.extensions"="org.wso2.micro.integrator.mediation.security.vault.xpath.SecureVaultLookupXPathFunctionProvider,org.wso2.micro.integrator.mediation.security.vault.external.hashicorp.HashiCorpVaultLookupXPathFunctionProvider" 

Ex: by default, it is not enabled in the MI server. We could observe the below exceptions in the logs if we haven't enabled them.

[2021-08-17 16:13:54,863] ERROR {SynapseXPath} - Evaluation of the XPath expression hashicorp:vault-lookup('path-name', 'field-name')  resulted in an error org.jaxen.UnresolvableException: No Such Function vault-lookup
	at org.jaxen.SimpleFunctionContext.getFunction(SimpleFunctionContext.java:127)
	at org.apache.synapse.util.xpath.SynapseXPathFunctionContext.getFunction(SynapseXPathFunctionContext.java:101)
	at org.jaxen.ContextSupport.getFunction(ContextSupport.java:242)
	at org.jaxen.Context.getFunction(Context.java:216)
	at org.jaxen.expr.DefaultFunctionCallExpr.evaluate(DefaultFunctionCallExpr.java:176)
	at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:102)
	at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:675)
	at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:215)
	at org.jaxen.BaseXPath.evaluate(BaseXPath.java:175)
	at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf(SynapseXPath.java:408)
	at org.apache.synapse.mediators.builtin.PropertyMediator.getResultValue(PropertyMediator.java:392)
	at org.apache.synapse.mediators.builtin.PropertyMediator.mediate(PropertyMediator.java:125)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
	at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
	at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:226)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
	at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:368)
	at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:427)
	at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:181)
	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)```

[chanikag]

https://mi.docs.wso2.com/en/latest/install-and-setup/setup/security/using-hashicorp-secrets/